diff --git a/developer_manual/conf.py b/developer_manual/conf.py
index 422067911..932863ede 100644
--- a/developer_manual/conf.py
+++ b/developer_manual/conf.py
@@ -48,9 +48,9 @@ copyright = u'2012-2017, The Nextcloud developers'
 # built documents.
 #
 # The short X.Y version.
-version = '13'
+version = '12'
 # The full version, including alpha/beta/rc tags.
-release = '13'
+release = '12'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.